/*
   Copyright (C) 1999-2007 id Software, Inc. and contributors.
   For a list of contributors, see the accompanying CONTRIBUTORS file.

   This file is part of GtkRadiant.

   GtkRadiant is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   GtkRadiant is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

// imagelib.c

#include "inout.h"
#include "cmdlib.h"
#include "imagelib.h"
#include "vfs.h"

int fgetLittleShort( FILE *f ){
	byte b1, b2;

	b1 = fgetc( f );
	b2 = fgetc( f );

	return (short)( b1 + b2 * 256 );
}

int fgetLittleLong( FILE *f ){
	byte b1, b2, b3, b4;

	b1 = fgetc( f );
	b2 = fgetc( f );
	b3 = fgetc( f );
	b4 = fgetc( f );

	return b1 + ( b2 << 8 ) + ( b3 << 16 ) + ( b4 << 24 );
}

int bufLittleShort( byte *buf, int len, int *pos ){
	byte b1, b2;

	if ( ( len - *pos ) < 2 ) {
		Error( "Unexpected buffer end" );
	}

	b1 = buf[*pos]; *pos += 1;
	b2 = buf[*pos]; *pos += 1;

	return (short)( b1 + b2 * 256 );
}

int bufLittleLong( byte *buf, int len, int *pos ){
	byte b1, b2, b3, b4;

	if ( ( len - *pos ) < 4 ) {
		Error( "Unexpected buffer end" );
	}

	b1 = buf[*pos]; *pos += 1;
	b2 = buf[*pos]; *pos += 1;
	b3 = buf[*pos]; *pos += 1;
	b4 = buf[*pos]; *pos += 1;

	return b1 + ( b2 << 8 ) + ( b3 << 16 ) + ( b4 << 24 );
}


/*
   ============================================================================

                        LBM STUFF

   ============================================================================
 */


typedef unsigned char UBYTE;
//conflicts with windows typedef short			WORD;
typedef unsigned short UWORD;
typedef long LONG;

typedef enum
{
	ms_none,
	ms_mask,
	ms_transcolor,
	ms_lasso
} mask_t;

typedef enum
{
	cm_none,
	cm_rle1
} compress_t;

typedef struct
{
	UWORD w,h;
	short x,y;
	UBYTE nPlanes;
	UBYTE masking;
	UBYTE compression;
	UBYTE pad1;
	UWORD transparentColor;
	UBYTE xAspect,yAspect;
	short pageWidth,pageHeight;
} bmhd_t;

extern bmhd_t bmhd;                         // will be in native byte order



#define FORMID ( 'F' + ( 'O' << 8 ) + ( (int)'R' << 16 ) + ( (int)'M' << 24 ) )
#define ILBMID ( 'I' + ( 'L' << 8 ) + ( (int)'B' << 16 ) + ( (int)'M' << 24 ) )
#define PBMID  ( 'P' + ( 'B' << 8 ) + ( (int)'M' << 16 ) + ( (int)' ' << 24 ) )
#define BMHDID ( 'B' + ( 'M' << 8 ) + ( (int)'H' << 16 ) + ( (int)'D' << 24 ) )
#define BODYID ( 'B' + ( 'O' << 8 ) + ( (int)'D' << 16 ) + ( (int)'Y' << 24 ) )
#define CMAPID ( 'C' + ( 'M' << 8 ) + ( (int)'A' << 16 ) + ( (int)'P' << 24 ) )


bmhd_t bmhd;

int    Align( int l ){
	if ( l & 1 ) {
		return l + 1;
	}
	return l;
}



/*
   ================
   LBMRLEdecompress

   Source must be evenly aligned!
   ================
 */
byte  *LBMRLEDecompress( byte *source,byte *unpacked, int bpwidth ){
	int count;
	byte b,rept;

	count = 0;

	do
	{
		rept = *source++;

		if ( rept > 0x80 ) {
			rept = ( rept ^ 0xff ) + 2;
			b = *source++;
			memset( unpacked,b,rept );
			unpacked += rept;
		}
		else if ( rept < 0x80 ) {
			rept++;
			memcpy( unpacked,source,rept );
			unpacked += rept;
			source += rept;
		}
		else{
			rept = 0;               // rept of 0x80 is NOP

		}
		count += rept;

	} while ( count < bpwidth );

	if ( count > bpwidth ) {
		Error( "Decompression exceeded width!\n" );
	}


	return source;
}


/*
   =================
   LoadLBM
   =================
 */
void LoadLBM( const char *filename, byte **picture, byte **palette ){
	byte    *LBMbuffer, *picbuffer, *cmapbuffer;
	int y;
	byte    *LBM_P, *LBMEND_P;
	byte    *pic_p;
	byte    *body_p;

	int formtype,formlength;
	int chunktype,chunklength;

// qiet compiler warnings
	picbuffer = NULL;
	cmapbuffer = NULL;

//
// load the LBM
//
	LoadFile( filename, (void **)&LBMbuffer );

//
// parse the LBM header
//
	LBM_P = LBMbuffer;
	if ( *(int *)LBMbuffer != LittleLong( FORMID ) ) {
		Error( "No FORM ID at start of file!\n" );
	}

	LBM_P += 4;
	formlength = BigLong( *(int *)LBM_P );
	LBM_P += 4;
	LBMEND_P = LBM_P + Align( formlength );

	formtype = LittleLong( *(int *)LBM_P );

	if ( formtype != ILBMID && formtype != PBMID ) {
		Error( "Unrecognized form type: %c%c%c%c\n", formtype & 0xff
			   ,( formtype >> 8 ) & 0xff,( formtype >> 16 ) & 0xff,( formtype >> 24 ) & 0xff );
	}

	LBM_P += 4;

//
// parse chunks
//

	while ( LBM_P < LBMEND_P )
	{
		chunktype = LBM_P[0] + ( LBM_P[1] << 8 ) + ( LBM_P[2] << 16 ) + ( LBM_P[3] << 24 );
		LBM_P += 4;
		chunklength = LBM_P[3] + ( LBM_P[2] << 8 ) + ( LBM_P[1] << 16 ) + ( LBM_P[0] << 24 );
		LBM_P += 4;

		switch ( chunktype )
		{
		case BMHDID:
			memcpy( &bmhd,LBM_P,sizeof( bmhd ) );
			bmhd.w = BigShort( bmhd.w );
			bmhd.h = BigShort( bmhd.h );
			bmhd.x = BigShort( bmhd.x );
			bmhd.y = BigShort( bmhd.y );
			bmhd.pageWidth = BigShort( bmhd.pageWidth );
			bmhd.pageHeight = BigShort( bmhd.pageHeight );
			break;

		case CMAPID:
			cmapbuffer = safe_malloc( 768 );
			memset( cmapbuffer, 0, 768 );
			memcpy( cmapbuffer, LBM_P, chunklength );
			break;

		case BODYID:
			body_p = LBM_P;

			pic_p = picbuffer = safe_malloc( bmhd.w * bmhd.h );
			if ( formtype == PBMID ) {
				//
				// unpack PBM
				//
				for ( y = 0 ; y < bmhd.h ; y++, pic_p += bmhd.w )
				{
					if ( bmhd.compression == cm_rle1 ) {
						body_p = LBMRLEDecompress( (byte *)body_p
												   , pic_p, bmhd.w );
					}
					else if ( bmhd.compression == cm_none ) {
						memcpy( pic_p,body_p,bmhd.w );
						body_p += Align( bmhd.w );
					}
				}

			}
			else
			{
				//
				// unpack ILBM
				//
				Error( "%s is an interlaced LBM, not packed", filename );
			}
			break;
		}

		LBM_P += Align( chunklength );
	}

	free( LBMbuffer );

	*picture = picbuffer;

	if ( palette ) {
		*palette = cmapbuffer;
	}
}


/*
   ============================================================================

                            WRITE LBM

   ============================================================================
 */

/*
   ==============
   WriteLBMfile
   ==============
 */
void WriteLBMfile( const char *filename, byte *data,
				   int width, int height, byte *palette ){
	byte    *lbm, *lbmptr;
	int    *formlength, *bmhdlength, *cmaplength, *bodylength;
	int length;
	bmhd_t basebmhd;

	lbm = lbmptr = safe_malloc( width * height + 1000 );

//
// start FORM
//
	*lbmptr++ = 'F';
	*lbmptr++ = 'O';
	*lbmptr++ = 'R';
	*lbmptr++ = 'M';

	formlength = (int*)lbmptr;
	lbmptr += 4;                      // leave space for length

	*lbmptr++ = 'P';
	*lbmptr++ = 'B';
	*lbmptr++ = 'M';
	*lbmptr++ = ' ';

//
// write BMHD
//
	*lbmptr++ = 'B';
	*lbmptr++ = 'M';
	*lbmptr++ = 'H';
	*lbmptr++ = 'D';

	bmhdlength = (int *)lbmptr;
	lbmptr += 4;                      // leave space for length

	memset( &basebmhd,0,sizeof( basebmhd ) );
	basebmhd.w = BigShort( (short)width );
	basebmhd.h = BigShort( (short)height );
	basebmhd.nPlanes = BigShort( 8 );
	basebmhd.xAspect = BigShort( 5 );
	basebmhd.yAspect = BigShort( 6 );
	basebmhd.pageWidth = BigShort( (short)width );
	basebmhd.pageHeight = BigShort( (short)height );

	memcpy( lbmptr,&basebmhd,sizeof( basebmhd ) );
	lbmptr += sizeof( basebmhd );

	length = lbmptr - (byte *)bmhdlength - 4;
	*bmhdlength = BigLong( length );
	if ( length & 1 ) {
		*lbmptr++ = 0;          // pad chunk to even offset

	}
//
// write CMAP
//
	*lbmptr++ = 'C';
	*lbmptr++ = 'M';
	*lbmptr++ = 'A';
	*lbmptr++ = 'P';

	cmaplength = (int *)lbmptr;
	lbmptr += 4;                      // leave space for length

	memcpy( lbmptr,palette,768 );
	lbmptr += 768;

	length = lbmptr - (byte *)cmaplength - 4;
	*cmaplength = BigLong( length );
	if ( length & 1 ) {
		*lbmptr++ = 0;          // pad chunk to even offset

	}
//
// write BODY
//
	*lbmptr++ = 'B';
	*lbmptr++ = 'O';
	*lbmptr++ = 'D';
	*lbmptr++ = 'Y';

	bodylength = (int *)lbmptr;
	lbmptr += 4;                      // leave space for length

	memcpy( lbmptr,data,width * height );
	lbmptr += width * height;

	length = lbmptr - (byte *)bodylength - 4;
	*bodylength = BigLong( length );
	if ( length & 1 ) {
		*lbmptr++ = 0;          // pad chunk to even offset

	}
//
// done
//
	length = lbmptr - (byte *)formlength - 4;
	*formlength = BigLong( length );
	if ( length & 1 ) {
		*lbmptr++ = 0;          // pad chunk to even offset

	}
//
// write output file
//
	SaveFile( filename, lbm, lbmptr - lbm );
	free( lbm );
}


/*
   ============================================================================

   LOAD PCX

   ============================================================================
 */

typedef struct
{
	char manufacturer;
	char version;
	char encoding;
	char bits_per_pixel;
	unsigned short xmin,ymin,xmax,ymax;
	unsigned short hres,vres;
	unsigned char palette[48];
	char reserved;
	char color_planes;
	unsigned short bytes_per_line;
	unsigned short palette_type;
	char filler[58];
	unsigned char data;             // unbounded
} pcx_t;


/*
   ==============
   LoadPCX
   ==============
 */

/* RR2DO2 */
#define DECODEPCX( b, d, r ) d = *b++; if ( ( d & 0xC0 ) == 0xC0 ) {r = d & 0x3F; d = *b++; }else{r = 1; }

void LoadPCX( const char *filename, byte **pic, byte **palette, int *width, int *height ){
	byte    *raw;
	pcx_t   *pcx;
	int x, y, lsize;
	int len;
	int dataByte, runLength;
	byte    *out, *pix;


	/* load the file */
	len = vfsLoadFile( filename, (void **)&raw, 0 );
	if ( len == -1 ) {
		Error( "LoadPCX: Couldn't read %s", filename );
	}


	/* parse the PCX file */
	pcx = (pcx_t *)raw;
	raw = &pcx->data;

	pcx->xmin = LittleShort( pcx->xmin );
	pcx->ymin = LittleShort( pcx->ymin );
	pcx->xmax = LittleShort( pcx->xmax );
	pcx->ymax = LittleShort( pcx->ymax );
	pcx->hres = LittleShort( pcx->hres );
	pcx->vres = LittleShort( pcx->vres );
	pcx->bytes_per_line = LittleShort( pcx->bytes_per_line );
	pcx->palette_type = LittleShort( pcx->palette_type );

	if ( pcx->manufacturer != 0x0a
		 || pcx->version != 5
		 || pcx->encoding != 1
		 || pcx->bits_per_pixel != 8
		 || pcx->xmax >= 640
		 || pcx->ymax >= 480 ) {
		Error( "Bad pcx file %s", filename );
	}

	if ( palette ) {
		*palette = safe_malloc( 768 );
		memcpy( *palette, (byte *)pcx + len - 768, 768 );
	}

	if ( width ) {
		*width = pcx->xmax + 1;
	}
	if ( height ) {
		*height = pcx->ymax + 1;
	}

	if ( !pic ) {
		return;
	}

	out = safe_malloc( ( pcx->ymax + 1 ) * ( pcx->xmax + 1 ) );
	if ( !out ) {
		Error( "LoadPCX: couldn't allocate" );
	}

	*pic = out;
	pix = out;

	/* RR2DO2: pcx fix  */
	lsize = pcx->color_planes * pcx->bytes_per_line;

	/* go scanline by scanline */
	for ( y = 0; y <= pcx->ymax; y++, pix += pcx->xmax + 1 )
	{
		/* do a scanline */
		for ( x = 0; x <= pcx->xmax; )
		{
			/* RR2DO2 */
			DECODEPCX( raw, dataByte, runLength );
			while ( runLength-- > 0 )
				pix[ x++ ] = dataByte;
		}

		/* RR2DO2: discard any other data */
		while ( x < lsize )
		{
			DECODEPCX( raw, dataByte, runLength );
			x++;
		}
		while ( runLength-- > 0 )
			x++;
	}

	/* validity check */
	if ( raw - (byte *) pcx > len ) {
		Error( "PCX file %s was malformed", filename );
	}
	free( pcx );
}



/*
   ==============
   WritePCXfile
   ==============
 */
void WritePCXfile( const char *filename, byte *data,
				   int width, int height, byte *palette ){
	int i, j, length;
	pcx_t   *pcx;
	byte        *pack;

	pcx = safe_malloc( width * height * 2 + 1000 );
	memset( pcx, 0, sizeof( *pcx ) );

	pcx->manufacturer = 0x0a;   // PCX id
	pcx->version = 5;           // 256 color
	pcx->encoding = 1;      // uncompressed
	pcx->bits_per_pixel = 8;        // 256 color
	pcx->xmin = 0;
	pcx->ymin = 0;
	pcx->xmax = LittleShort( (short)( width - 1 ) );
	pcx->ymax = LittleShort( (short)( height - 1 ) );
	pcx->hres = LittleShort( (short)width );
	pcx->vres = LittleShort( (short)height );
	pcx->color_planes = 1;      // chunky image
	pcx->bytes_per_line = LittleShort( (short)width );
	pcx->palette_type = LittleShort( 1 );     // not a grey scale

	// pack the image
	pack = &pcx->data;

	for ( i = 0 ; i < height ; i++ )
	{
		for ( j = 0 ; j < width ; j++ )
		{
			if ( ( *data & 0xc0 ) != 0xc0 ) {
				*pack++ = *data++;
			}
			else
			{
				*pack++ = 0xc1;
				*pack++ = *data++;
			}
		}
	}

	// write the palette
	*pack++ = 0x0c; // palette ID byte
	for ( i = 0 ; i < 768 ; i++ )
		*pack++ = *palette++;

// write output file
	length = pack - (byte *)pcx;
	SaveFile( filename, pcx, length );

	free( pcx );
}

/*
   ============================================================================

   LOAD BMP

   ============================================================================
 */


/*

   // we can't just use these structures, because
   // compiler structure alignment will not be portable
   // on this unaligned stuff

   typedef struct tagBITMAPFILEHEADER { // bmfh
        WORD    bfType;				// BM
        DWORD   bfSize;
        WORD    bfReserved1;
        WORD    bfReserved2;
        DWORD   bfOffBits;
   } BITMAPFILEHEADER;

   typedef struct tagBITMAPINFOHEADER{ // bmih
   DWORD  biSize;
   LONG   biWidth;
   LONG   biHeight;
   WORD   biPlanes;
   WORD   biBitCount
   DWORD  biCompression;
   DWORD  biSizeImage;
   LONG   biXPelsPerMeter;
   LONG   biYPelsPerMeter;
   DWORD  biClrUsed;
   DWORD  biClrImportant;
   } BITMAPINFOHEADER;

   typedef struct tagBITMAPINFO { // bmi
   BITMAPINFOHEADER bmiHeader;
   RGBQUAD          bmiColors[1];
   } BITMAPINFO;

   typedef struct tagBITMAPCOREHEADER { // bmch
        DWORD   bcSize;
        WORD    bcWidth;
        WORD    bcHeight;
        WORD    bcPlanes;
        WORD    bcBitCount;
   } BITMAPCOREHEADER;

   typedef struct _BITMAPCOREINFO {    // bmci
        BITMAPCOREHEADER  bmciHeader;
        RGBTRIPLE         bmciColors[1];
   } BITMAPCOREINFO;

 */

/*
   ==============
   LoadBMP
   ==============
 */
void LoadBMP( const char *filename, byte **pic, byte **palette, int *width, int *height ){
	byte  *out;
	int i;
	int bfSize;
	int bfOffBits;
	int structSize;
	int bcWidth;
	int bcHeight;
	int bcPlanes;
	int bcBitCount;
	byte bcPalette[1024];
	qboolean flipped;
	byte *in;
	int len, pos = 0;

	len = vfsLoadFile( filename, (void **)&in, 0 );
	if ( len == -1 ) {
		Error( "Couldn't read %s", filename );
	}

	i = bufLittleShort( in, len, &pos );
	if ( i != 'B' + ( 'M' << 8 ) ) {
		Error( "%s is not a bmp file", filename );
	}

	bfSize = bufLittleLong( in, len, &pos );
	bufLittleShort( in, len, &pos );
	bufLittleShort( in, len, &pos );
	bfOffBits = bufLittleLong( in, len, &pos );

	// the size will tell us if it is a
	// bitmapinfo or a bitmapcore
	structSize = bufLittleLong( in, len, &pos );
	if ( structSize == 40 ) {
		// bitmapinfo
		bcWidth = bufLittleLong( in, len, &pos );
		bcHeight = bufLittleLong( in, len, &pos );
		bcPlanes = bufLittleShort( in, len, &pos );
		bcBitCount = bufLittleShort( in, len, &pos );

		pos += 24;

		if ( palette ) {
			memcpy( bcPalette, in + pos, 1024 );
			pos += 1024;
			*palette = safe_malloc( 768 );

			for ( i = 0 ; i < 256 ; i++ )
			{
				( *palette )[i * 3 + 0] = bcPalette[i * 4 + 2];
				( *palette )[i * 3 + 1] = bcPalette[i * 4 + 1];
				( *palette )[i * 3 + 2] = bcPalette[i * 4 + 0];
			}
		}
	}
	else if ( structSize == 12 ) {
		// bitmapcore
		bcWidth = bufLittleShort( in, len, &pos );
		bcHeight = bufLittleShort( in, len, &pos );
		bcPlanes = bufLittleShort( in, len, &pos );
		bcBitCount = bufLittleShort( in, len, &pos );

		if ( palette ) {
			memcpy( bcPalette, in + pos, 768 );
			pos += 768;
			*palette = safe_malloc( 768 );

			for ( i = 0 ; i < 256 ; i++ ) {
				( *palette )[i * 3 + 0] = bcPalette[i * 3 + 2];
				( *palette )[i * 3 + 1] = bcPalette[i * 3 + 1];
				( *palette )[i * 3 + 2] = bcPalette[i * 3 + 0];
			}
		}
	}
	else {
		Error( "%s had strange struct size", filename );
	}

	if ( bcPlanes != 1 ) {
		Error( "%s was not a single plane image", filename );
	}

	if ( bcBitCount != 8 ) {
		Error( "%s was not an 8 bit image", filename );
	}

	if ( bcHeight < 0 ) {
		bcHeight = -bcHeight;
		flipped = qtrue;
	}
	else {
		flipped = qfalse;
	}

	if ( width ) {
		*width = bcWidth;
	}
	if ( height ) {
		*height = bcHeight;
	}

	if ( !pic ) {
		free( in );
		return;
	}

	out = safe_malloc( bcWidth * bcHeight );
	*pic = out;
	pos = bfOffBits;

	if ( flipped ) {
		for ( i = 0 ; i < bcHeight ; i++ ) {
			memcpy( out + bcWidth * ( bcHeight - 1 - i ), in + pos, bcWidth );
			pos += bcWidth;
		}
	}
	else {
		memcpy( out, in + pos, bcWidth * bcHeight );
		pos += bcWidth * bcHeight;
	}

	free( in );
}


/*
   ============================================================================

   LOAD IMAGE

   ============================================================================
 */

/*
   ==============
   Load256Image

   Will load either an lbm or pcx, depending on extension.
   Any of the return pointers can be NULL if you don't want them.
   ==============
 */
void Load256Image( const char *name, byte **pixels, byte **palette, int *width, int *height ){
	char ext[128];

	ExtractFileExtension( name, ext );
	if ( !Q_stricmp( ext, "lbm" ) ) {
		LoadLBM( name, pixels, palette );
		if ( width ) {
			*width = bmhd.w;
		}
		if ( height ) {
			*height = bmhd.h;
		}
	}
	else if ( !Q_stricmp( ext, "pcx" ) ) {
		LoadPCX( name, pixels, palette, width, height );
	}
	else if ( !Q_stricmp( ext, "bmp" ) ) {
		LoadBMP( name, pixels, palette, width, height );
	}
	else{
		Error( "%s doesn't have a known image extension", name );
	}
}


/*
   ==============
   Save256Image

   Will save either an lbm or pcx, depending on extension.
   ==============
 */
void Save256Image( const char *name, byte *pixels, byte *palette,
				   int width, int height ){
	char ext[128];

	ExtractFileExtension( name, ext );
	if ( !Q_stricmp( ext, "lbm" ) ) {
		WriteLBMfile( name, pixels, width, height, palette );
	}
	else if ( !Q_stricmp( ext, "pcx" ) ) {
		WritePCXfile( name, pixels, width, height, palette );
	}
	else{
		Error( "%s doesn't have a known image extension", name );
	}
}




/*
   ============================================================================

   TARGA IMAGE

   ============================================================================
 */

typedef struct _TargaHeader {
	unsigned char id_length, colormap_type, image_type;
	unsigned short colormap_index, colormap_length;
	unsigned char colormap_size;
	unsigned short x_origin, y_origin, width, height;
	unsigned char pixel_size, attributes;
} TargaHeader;

void TargaError( TargaHeader *t, const char *message ){
	Sys_Printf( "%s\n:TargaHeader:\nuint8 id_length = %i;\nuint8 colormap_type = %i;\nuint8 image_type = %i;\nuint16 colormap_index = %i;\nuint16 colormap_length = %i;\nuint8 colormap_size = %i;\nuint16 x_origin = %i;\nuint16 y_origin = %i;\nuint16 width = %i;\nuint16 height = %i;\nuint8 pixel_size = %i;\nuint8 attributes = %i;\n", message, t->id_length, t->colormap_type, t->image_type, t->colormap_index, t->colormap_length, t->colormap_size, t->x_origin, t->y_origin, t->width, t->height, t->pixel_size, t->attributes );
}

/*
   =============
   LoadTGABuffer
   =============
 */
void LoadTGABuffer( const byte *f, const byte *enddata, byte **pic, int *width, int *height ){
	int x, y, row_inc, compressed, readpixelcount, red, green, blue, alpha, runlen, pindex, alphabits, image_width, image_height;
	byte *pixbuf, *image_rgba;
	const byte *fin;
	unsigned char *p;
	TargaHeader targa_header;
	unsigned char palette[256 * 4];

	*pic = NULL;

	// abort if it is too small to parse
	if ( enddata - f < 19 ) {
		return;
	}

	targa_header.id_length = f[0];
	targa_header.colormap_type = f[1];
	targa_header.image_type = f[2];

	targa_header.colormap_index = f[3] + f[4] * 256;
	targa_header.colormap_length = f[5] + f[6] * 256;
	targa_header.colormap_size = f[7];
	targa_header.x_origin = f[8] + f[9] * 256;
	targa_header.y_origin = f[10] + f[11] * 256;
	targa_header.width = image_width = f[12] + f[13] * 256;
	targa_header.height = image_height = f[14] + f[15] * 256;

	targa_header.pixel_size = f[16];
	targa_header.attributes = f[17];

	// advance to end of header
	fin = f + 18;

	// skip TARGA image comment (usually 0 bytes)
	fin += targa_header.id_length;

	// read/skip the colormap if present (note: according to the TARGA spec it
	// can be present even on truecolor or greyscale images, just not used by
	// the image data)
	if ( targa_header.colormap_type ) {
		if ( targa_header.colormap_length > 256 ) {
			TargaError( &targa_header, "LoadTGA: only up to 256 colormap_length supported\n" );
			return;
		}
		if ( targa_header.colormap_index ) {
			TargaError( &targa_header, "LoadTGA: colormap_index not supported\n" );
			return;
		}
		if ( targa_header.colormap_size == 24 ) {
			for ( x = 0; x < targa_header.colormap_length; x++ )
			{
				palette[x * 4 + 2] = *fin++;
				palette[x * 4 + 1] = *fin++;
				palette[x * 4 + 0] = *fin++;
				palette[x * 4 + 3] = 255;
			}
		}
		else if ( targa_header.colormap_size == 32 ) {
			for ( x = 0; x < targa_header.colormap_length; x++ )
			{
				palette[x * 4 + 2] = *fin++;
				palette[x * 4 + 1] = *fin++;
				palette[x * 4 + 0] = *fin++;
				palette[x * 4 + 3] = *fin++;
			}
		}
		else
		{
			TargaError( &targa_header, "LoadTGA: Only 32 and 24 bit colormap_size supported\n" );
			return;
		}
	}

	// check our pixel_size restrictions according to image_type
	if ( targa_header.image_type == 2 || targa_header.image_type == 10 ) {
		if ( targa_header.pixel_size != 24 && targa_header.pixel_size != 32 ) {
			TargaError( &targa_header, "LoadTGA: only 24bit and 32bit pixel sizes supported for type 2 and type 10 images\n" );
			return;
		}
	}
	else if ( targa_header.image_type == 1 || targa_header.image_type == 9 ) {
		if ( targa_header.pixel_size != 8 ) {
			TargaError( &targa_header, "LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n" );
			return;
		}
	}
	else if ( targa_header.image_type == 3 || targa_header.image_type == 11 ) {
		if ( targa_header.pixel_size != 8 ) {
			TargaError( &targa_header, "LoadTGA: only 8bit pixel size for type 1, 3, 9, and 11 images supported\n" );
			return;
		}
	}
	else
	{
		TargaError( &targa_header, "LoadTGA: Only type 1, 2, 3, 9, 10, and 11 targa RGB images supported" );
		return;
	}

	if ( targa_header.attributes & 0x10 ) {
		TargaError( &targa_header, "LoadTGA: origin must be in top left or bottom left, top right and bottom right are not supported\n" );
		return;
	}

	// number of attribute bits per pixel, we only support 0 or 8
	alphabits = targa_header.attributes & 0x0F;
	if ( alphabits != 8 && alphabits != 0 ) {
		TargaError( &targa_header, "LoadTGA: only 0 or 8 attribute (alpha) bits supported\n" );
		return;
	}

	image_rgba = safe_malloc( image_width * image_height * 4 );
	if ( !image_rgba ) {
		Sys_Printf( "LoadTGA: not enough memory for %i by %i image\n", image_width, image_height );
		return;
	}

	// If bit 5 of attributes isn't set, the image has been stored from bottom to top
	if ( ( targa_header.attributes & 0x20 ) == 0 ) {
		pixbuf = image_rgba + ( image_height - 1 ) * image_width * 4;
		row_inc = -image_width * 4 * 2;
	}
	else
	{
		pixbuf = image_rgba;
		row_inc = 0;
	}

	compressed = targa_header.image_type == 9 || targa_header.image_type == 10 || targa_header.image_type == 11;
	x = 0;
	y = 0;
	red = green = blue = alpha = 255;
	while ( y < image_height )
	{
		// decoder is mostly the same whether it's compressed or not
		readpixelcount = 1000000;
		runlen = 1000000;
		if ( compressed && fin < enddata ) {
			runlen = *fin++;
			// high bit indicates this is an RLE compressed run
			if ( runlen & 0x80 ) {
				readpixelcount = 1;
			}
			runlen = 1 + ( runlen & 0x7f );
		}

		while ( ( runlen-- ) && y < image_height )
		{
			if ( readpixelcount > 0 ) {
				readpixelcount--;
				red = green = blue = alpha = 255;
				if ( fin < enddata ) {
					switch ( targa_header.image_type )
					{
					case 1:
					case 9:
						// colormapped
						pindex = *fin++;
						if ( pindex >= targa_header.colormap_length ) {
							pindex = 0; // error
						}
						p = palette + pindex * 4;
						red = p[0];
						green = p[1];
						blue = p[2];
						alpha = p[3];
						break;
					case 2:
					case 10:
						// BGR or BGRA
						blue = *fin++;
						if ( fin < enddata ) {
							green = *fin++;
						}
						if ( fin < enddata ) {
							red = *fin++;
						}
						if ( targa_header.pixel_size == 32 && fin < enddata ) {
							alpha = *fin++;
						}
						break;
					case 3:
					case 11:
						// greyscale
						red = green = blue = *fin++;
						break;
					}
					if ( !alphabits ) {
						alpha = 255;
					}
				}
			}
			*pixbuf++ = red;
			*pixbuf++ = green;
			*pixbuf++ = blue;
			*pixbuf++ = alpha;
			x++;
			if ( x == image_width ) {
				// end of line, advance to next
				x = 0;
				y++;
				pixbuf += row_inc;
			}
		}
	}

	*pic = image_rgba;
	if ( width ) {
		*width = image_width;
	}
	if ( height ) {
		*height = image_height;
	}
}


/*
   =============
   LoadTGA
   =============
 */
void LoadTGA( const char *name, byte **pixels, int *width, int *height ){
	byte            *buffer;
	int nLen;
	//
	// load the file
	//
	nLen = vfsLoadFile( ( char * ) name, (void **)&buffer, 0 );
	if ( nLen == -1 ) {
		Error( "Couldn't read %s", name );
	}

	LoadTGABuffer( buffer, buffer + nLen, pixels, width, height );

}


/*
   ================
   WriteTGA
   ================
 */
void WriteTGA( const char *filename, byte *data, int width, int height ) {
	byte    *buffer;
	int i;
	int c;
	FILE    *f;

	buffer = safe_malloc( width * height * 4 + 18 );
	memset( buffer, 0, 18 );
	buffer[2] = 2;      // uncompressed type
	buffer[12] = width & 255;
	buffer[13] = width >> 8;
	buffer[14] = height & 255;
	buffer[15] = height >> 8;
	buffer[16] = 32;    // pixel size

	// swap rgb to bgr
	c = 18 + width * height * 4;
	for ( i = 18 ; i < c ; i += 4 )
	{
		buffer[i] = data[i - 18 + 2];       // blue
		buffer[i + 1] = data[i - 18 + 1];     // green
		buffer[i + 2] = data[i - 18 + 0];     // red
		buffer[i + 3] = data[i - 18 + 3];     // alpha
	}

	f = fopen( filename, "wb" );
	fwrite( buffer, 1, c, f );
	fclose( f );

	free( buffer );
}

/*
   ============================================================================

   LOAD32BITIMAGE

   ============================================================================
 */

/*
   ==============
   Load32BitImage

   Any of the return pointers can be NULL if you don't want them.
   ==============
 */
void Load32BitImage( const char *name, unsigned **pixels,  int *width, int *height ){
	char ext[128];
	byte    *palette;
	byte    *pixels8;
	byte    *pixels32;
	int size;
	int i;
	int v;

	ExtractFileExtension( name, ext );
	if ( !Q_stricmp( ext, "tga" ) ) {
		LoadTGA( name, (byte **)pixels, width, height );
	}
	else {
		Load256Image( name, &pixels8, &palette, width, height );
		if ( !pixels ) {
			return;
		}
		size = *width * *height;
		pixels32 = safe_malloc( size * 4 );
		*pixels = (unsigned *)pixels32;
		for ( i = 0 ; i < size ; i++ ) {
			v = pixels8[i];
			pixels32[i * 4 + 0] = palette[ v * 3 + 0 ];
			pixels32[i * 4 + 1] = palette[ v * 3 + 1 ];
			pixels32[i * 4 + 2] = palette[ v * 3 + 2 ];
			pixels32[i * 4 + 3] = 0xff;
		}
	}
}
